Manual Setup with Kerio Mailserver

Hello,

i have a Kerio Mailserver on Linux Ubuntu an want to connect Kerio with it via Exchange Web Services.

The automatic Setup is not possible in the same Network as the server - because of routing.

Unfortunately i cannot select Kerio at the setup. I can select Microschrott Exchange and everything works, but then i get Header Errors when syncing. Is there a way around?

A manual Exchange Server Setup would be great.

I love your Software - keep going!

Best regards
Samy